wanted 45/70 single shot rifle or??

Looking for a 45/70 single shot rifle or similar caliber. Prefer falling block style and no short barreled carbines . desire a creedmore type rear sight butnot a deal breaker browning, sharps or??? can be smokless and or black powder. will consider 45/90 45/110/ 50 110 etc. if you have one that you are not using and possibly might sell please let me know tks Dennis